Deej Dy
Verified Ladder Scurb 乁( ◔ ౪◔)ㄏ
I think Endeavor Viv is still pretty heat as it gets past Steelix or severely weakens it and other mon like Klingklang can come in and do its thang. Quag makes sense it has always been a little underrated. No comment on Regirock.
B->B
With Sceptile gone, prominent pokemon like tauros/archeops became great again, and regirock having ability to check some of the top tier threats without difficulties makes it a great stealth rocker in this metagame. Its rock typing, titanic defense stat, and a really solid spdef makes it a great physical wall while also providing a good check to Special sweepers like Swellow,vivillon, and fire types like Zard,pyroar,magmortar. It competes with steelix and rhydon for a stealth rock user, but having a greater spdef stat, not having a crippling X4 weakness to grass(which most fire types have as coverage move)like Don,being able to have passive recovery in leftovers, and having access to thunder wave to support team is pretty useful.
B->B
Quagsire is a pokemon that fits best on defensive teams(particularly stall teams) because its a great addition to stall and it does great job there,it hardly finds its use outside of more defensive builds because its somewhat passive, Stall archetypes arent that common from what ive seen but Stall definitely has the good potential in right hands and a lot of people are not prepared for it. Quagsire also walls a lot of threats in this meta,from SD rott/tops/malamar to pokemon like DD rhydon/SD scyther and even the bigger threats like tauros which makes it a good physical wall with nice bulk and Unaware ability.
A>A-
While I can agree why Vivillon is a good sweeper(having the ability to fire off a strong hurricanes without really being afraid to miss since its good ability in compound eyes, having the access to Sleep powder,quiver dances) ,its bad bulk/horrible defensive typing/4x stealth rock weakness and relying on sash is downside of using it, also now that Steelix is one of the best stealth rocker in tier being able to check it pretty decently, lanturn rise in usage also hurts it,and regirock is another thing i can see in future being used more that walls it, a lot of offensive threats like floatzel/archeops/tauros and fire types can check it offensively and priority can pick it off, and Id say it needs more support than it used to have in previous metagames.Its still a great pokemon,dont get me wrong,its really threatening to face but I think its at least nomination worthy.
Here's the set I use which tears apart teams pretty well and at least gets something to sleep:
Viv w da focus sash
252 spc attack 252 speed
Timid
Quiver Dance
Sleep Powder
Hurricane
Endeavor